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Related Experiment Videos

MAP kinase activation by cyclosporine A

L Paslaru1, S Trigon, M Kuhlmann

  • 1University of Medicine and Pharmacy Carol Davila, Post-Graduate Department of Biochemistry, Fundeni Hospital, Bucharest, Romania.

Biochemical and Biophysical Research Communications
|July 30, 1997
PubMed
Summary

Cyclosporine A activates mitogen-activated protein (MAP) kinases ERK1 and ERK2 in various cell types. This activation may stem from disruptions in cellular calcium homeostasis caused by Cyclosporine A treatment.

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Area of Science:

  • Cellular signaling pathways
  • Molecular biology
  • Biochemistry

Background:

  • Mitogen-activated protein (MAP) kinases are crucial regulators of cellular processes.
  • Cyclosporine A (CsA) is an immunosuppressive drug with known cellular effects.
  • The impact of CsA on MAP kinase activation requires further elucidation.

Purpose of the Study:

  • To investigate the effect of short-term Cyclosporine A treatment on MAP kinase activity.
  • To identify specific MAP kinases activated by CsA.
  • To explore potential mechanisms underlying CsA-induced MAP kinase activation.

Main Methods:

  • HeLa cells were treated with Cyclosporine A.
  • Crude cell extracts were analyzed for MAP kinase-like activity.

Related Experiment Videos

  • Chromatography (Mono Q) and Western Blotting were used to identify and confirm MAP kinase activation (ERK1/ERK2).

    • Main Results:

    • Short-term CsA treatment activated MAP kinase-like activity in HeLa cell extracts.
    • Two distinct activities co-eluting with ERK1 and ERK2 were identified.
    • Western blotting confirmed the activation of ERK1 and ERK2, evidenced by slower migrating forms on SDS-PAGE, in HeLa, BSC-1, and 3T3 cells.

    Conclusions:

    • Cyclosporine A induces the activation of MAP kinases ERK1 and ERK2.
    • This activation is observed across different cell types, including HeLa, renal epithelial (BSC-1), and fibroblast (3T3) cells.
    • MAP kinase activation by CsA may be linked to perturbations in cellular calcium homeostasis.